Freud believed that the oral period is from 0 to 12 months after birth, so hand eating is instinctive and should not be stopped. If the oral period is not satisfied, it will affect his personality development!
What if his hands are so dirty?
No, just a little more! (LOL)
Worst case scenario, if you really have diarrhea, think of it as an exposure to create more antibodies in your body! (LOL again)
*Translated with www.DeepL.com/Translator (free version)*